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EP1891305A2 - Device for coupling a vacuum pump with a camshaft comprising means supplying lubricating fluid - Google Patents

Device for coupling a vacuum pump with a camshaft comprising means supplying lubricating fluid

Info

Publication number
EP1891305A2
EP1891305A2 EP06794455A EP06794455A EP1891305A2 EP 1891305 A2 EP1891305 A2 EP 1891305A2 EP 06794455 A EP06794455 A EP 06794455A EP 06794455 A EP06794455 A EP 06794455A EP 1891305 A2 EP1891305 A2 EP 1891305A2
Authority
EP
European Patent Office
Prior art keywords
camshaft
pump
torque
radial
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06794455A
Other languages
German (de)
French (fr)
Inventor
Guy Eberhardt
Jean Claude Kuhn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SA
Original Assignee
Renault SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SA filed Critical Renault SA
Publication of EP1891305A2 publication Critical patent/EP1891305A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/023—Lubricant distribution through a hollow driving shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/108—Lubrication of valve gear or auxiliaries of auxiliaries
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/06—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/1836—Rotary to rotary

Definitions

  • Device for coupling a vacuum pump with a camshaft comprising means for supplying lubricating fluid.
  • the present invention relates to a device for coupling a vacuum pump with an internal combustion engine camshaft for a motor vehicle for the purpose of rotating said vacuum pump.
  • An internal combustion engine camshaft may be subjected to more or less resistant torques during operation of the engine.
  • a coupling is generally required to effectively transmit the engine torque provided by a crankshaft of the engine to the camshaft.
  • This coupling, or another coupling can also be used to control a pump, especially a vacuum pump.
  • the braking assistance is provided by a brake booster connected to a vacuum pump which is rotated by the engine, for example by means of a motor.
  • a coupling device attached to one end of the engine camshaft in this regard, reference may be made to the WO document
  • Said device comprises a body inside which is formed a stage bore receiving the end of the camshaft and allowing the passage of a screw adapted to bear against a portion of said body so as to ensure the fixing of the device on the camshaft.
  • the body also includes radial grooves cooperating with tenons of the vacuum pump for transmitting the torque to said pump.
  • the bore of the body is shaped to allow fluid communication between the camshaft and the vacuum pump to lubricate the pump with a lubricating fluid used for the engine.
  • this device causes a difficult assembly, it includes a body of relatively complex and expensive form, which may be incompatible with mass industrialization.
  • the present invention therefore aims to overcome these disadvantages, by providing a coupling device of a vacuum pump with an internal combustion engine camshaft particularly easy to assemble, economical, reliable.
  • the present invention also aims to provide a coupling device of a vacuum pump with a camshaft which can be coupled to said camshaft after wedging thereof.
  • the subject of the invention is a device for coupling a vacuum pump with a tubular camshaft of an internal combustion engine for a motor vehicle, comprising a nozzle provided with first and second coaxial portions delimiting an annular space. within which is mounted one end of the camshaft, at least one of said portions being adapted to transmit torque to the camshaft, and means for transmitting said torque to the pump.
  • Said second axial portion is provided with a housing extending along said axis and intended to receive a means of sampling the pump capable of taking a lubricating fluid conveyed inside the camshaft so as to ensure fluidic communication between the camshaft and the pump.
  • the device has the advantage of comprising a single end piece allowing not only the transmission of a torque to the shaft and the vacuum pump, but also the fluid supply of said pump via the camshaft, in a particularly simple and economical way, while freeing from mounting constraints. expensive and complex.
  • the first portion comprises a bore inside which is fitted the end of the camshaft.
  • first and second portions are interconnected by a radial end wall.
  • Such an arrangement makes it possible to obtain a sealed end piece substantially limiting any leakage to the outside of the lubricating fluid present inside the camshaft.
  • the first and second portions and the end wall are monobloc, which allows to obtain an economical device, easy to assemble and transport.
  • the annular space may have a radial dimension substantially greater than the thickness of the camshaft.
  • the tip further comprises at least one radial flange portion extending outwardly from the first portion and adapted to receive a driving torque from the camshaft.
  • the torque transmission means to the pump comprise radial groove formed at the tip.
  • the device further comprises a flange secured to the camshaft, a pairing pinion mounted on said end flange, a chain sprocket attached to said pairing gear, the hub being mounted directly or indirectly on the spindle. chain sprocket.
  • the housing of the second axial portion consists of a bore.
  • FIG 1 is a schematic sectional view of a coupling device according to the invention mounted on a camshaft and driving a vacuum pump;
  • FIG 2 is a perspective view of the device of Figure 1;
  • FIGS. 3 and 4 are perspective views of a tip of the device of FIG.
  • FIGS 1 and 2 show a camshaft 1 provided with a device according to the invention, designated by the general numerical reference 2, and allowing the coupling of a vacuum pump 3 with said shaft 1
  • the camshaft 1 has been partially illustrated. Note, however, that it consists essentially of a tube 4 externally carrying a set of cams 5, as is known per se.
  • the coupling device 2 comprises a tip 6 made in one piece and provided with a first annular portion 7, forming a sleeve coaxial with the shaft 1, and secured to one end of the tube 4.
  • the first portion 7 is extended axially in the direction of the vacuum pump 3, by a radial end wall 8, which extends axially itself, on the opposite side to said pump 3, by a second axial portion 9 essentially cylindrical.
  • the second portion 9 here comprises a front radial surface 9a substantially axially offset with respect to a front radial surface 7a of the first portion 7, in the direction of the radial wall 8.
  • the first and second portions 7, 9 are coaxial and define an annular space 8a inside which the end of the tube 4 is mounted.
  • the annular space 8a here has a radial dimension substantially greater than the thickness of the shaft. 1 to cams, so as to leave a slight radial space between a bore of said shaft and the second portion 9 to facilitate the fitting of the first portion 7 on the shaft 1, during assembly of the nozzle 6.
  • the end piece 6 also comprises radial portions forming flanges, here three in number and referenced 10 to 12, extending radially outwardly from the first portion 7 and able to receive a driving torque.
  • the flanges 10 to 12 are here uniformly distributed over the circumference of the first portion 7 and respectively comprise bores 10a to 12a allowing the passage of fastening screws (not shown) for the transmission of the engine torque.
  • the transmittable torque is a function of the length of the first portion 7, its thickness as well as its limit at break.
  • the nozzle 6 comprises a radial groove 13 formed at the radial end wall 8 and cooperating with lugs 15 and 16 of the pump 3, of complementary shape, arranged to one of its axial ends.
  • the tip 6 also comprises a housing 17 formed here in the form of a bore passing right through the second portion 9, and which opens at a front surface of the radial wall 8.
  • the housing 17 is coaxial with the camshaft 1.
  • a sampling means 18 of said pump is mounted inside said housing 17.
  • the sampling means 18 comprises a tubular pipette 19 coaxial with the shaft 1 and mounted partly inside a bore
  • the pipette 19 is projecting with respect to an end surface of said pump 3, and provided, near its axial end, an annular lip 20 in contact with the housing 17 of in order to achieve a good seal between the nozzle 6 and said pipette 19 to substantially reduce the risk of leakage to the outside of the lubricating fluid.
  • the pipette 19 thus makes it possible to supply lubricating fluid to the supply channels 21 of the pump 3 for its lubrication.
  • the nozzle 6 is thus not only intended to receive a driving torque, to transmit it to the camshaft 1 as well as to the pump
  • the coupling device 2 also comprises a drive member 22 here provided with a flange 23 fixed on the camshaft 1 near its axial end, with a pairing pinion 24. disposed on said flange 23, a chain sprocket 25 attached to said pairing gear, axially on the opposite side to the flange 23, and a fixing spacer 26 mounted axially between the chain gear 25 and the front radial surface 9a of the end piece 6.
  • a first step is to fix the flange 23 on the camshaft 1, for example by welding, by shrinking, or by gluing. Then, the pairing pinion 24, the chain pinion 25, and the spacer 26 are put in place, by means of fixing screws (not shown), on the flange 23, without tightening the said screws. The crankshaft of the engine and the camshaft 1 are then locked in rotation, and a distribution chain mounted on the pinion 25 is tensioned. Depending on the tension of said chain, the pinions 24 and 25 pivot slightly with respect to the 1 camshaft through oblong holes (not shown) formed on said pinion. Finally, the sprockets 24, 25 and the spacer are immobilized

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Rotary Pumps (AREA)

Abstract

The invention concerns a device for coupling a vacuum pump (3) with a camshaft (1) of a motor vehicle internal combustion engine, comprising an endpiece (6) provided with first and second coaxial portions (7, 9) delimiting an annular space wherein is mounted one of the ends of the camshaft, at least one of said portions being adapted to transmit a torque to the camshaft, and means for transmitting said torque to the pump. Said second axial portion (9) is provided with a housing (18) extending along said axis and designed to receive a means for drawing from the pump adapted to draw a lubricating fluid directed into the camshaft so as to provide a fluid communication between the camshaft and the pump.

Description

Dispositif d'accouplement d'une pompe à vide avec un arbre à cames comprenant des moyens d'alimentation en fluide lubrifiant. Device for coupling a vacuum pump with a camshaft comprising means for supplying lubricating fluid.

La présente invention concerne un dispositif d' accouplement d'une pompe à vide avec un arbre à cames de moteur à combustion interne pour véhicule automobile en vue de l' entraînement en rotation de ladite pompe à vide.The present invention relates to a device for coupling a vacuum pump with an internal combustion engine camshaft for a motor vehicle for the purpose of rotating said vacuum pump.

Un arbre à cames de moteur à combustion interne peut être soumis à des couples résistants plus ou moins importants lors du fonctionnement du moteur. Un accouplement est généralement nécessaire pour transmettre efficacement le couple moteur fourni par un vilebrequin du moteur à l' arbre à cames. Cet accouplement, ou un autre accouplement, peut également être utilisé pour commander une pompe, notamment une pompe à vide. En effet, dans un véhicule automobile comprenant un moteur à combustion interne de type Diesel, l' assistance au freinage est assurée par un servofrein relié à une pompe à vide qui est entraînée en rotation par le moteur, par exemple par l' intermédiaire d'un dispositif d' accouplement fixé à une extrémité de l' arbre à cames du moteur. A cet égard, on pourra se référer au document WOAn internal combustion engine camshaft may be subjected to more or less resistant torques during operation of the engine. A coupling is generally required to effectively transmit the engine torque provided by a crankshaft of the engine to the camshaft. This coupling, or another coupling, can also be used to control a pump, especially a vacuum pump. Indeed, in a motor vehicle comprising a diesel type internal combustion engine, the braking assistance is provided by a brake booster connected to a vacuum pump which is rotated by the engine, for example by means of a motor. a coupling device attached to one end of the engine camshaft. In this regard, reference may be made to the WO document

2004/057163, qui décrit la transmission du couple de l' arbre à cames d'un moteur à une pompe à vide par l' intermédiaire d'un tel dispositif d' accouplement. Ledit dispositif comprend un corps à l' intérieur duquel est ménagé un alésage étage recevant l' extrémité de l' arbre à cames et permettant le passage d'une vis apte à venir en appui contre une portion dudit corps de manière à assurer la fixation du dispositif sur l' arbre à cames. Le corps comprend également des rainures radiales coopérant avec des tenons de la pompe à vide pour la transmission du couple à ladite pompe. Par ailleurs, l' alésage du corps est conformé de manière à permettre une communication fluidique entre l' arbre à cames et la pompe à vide pour lubrifier la pompe avec un fluide lubrifiant utilisé pour le moteur. Outre le fait que ce dispositif engendre un montage difficile, il comprend un corps de forme relativement complexe et coûteuse, pouvant être incompatible avec une industrialisation en grande série.2004/057163, which describes the transmission of engine camshaft torque to a vacuum pump via such a coupling device. Said device comprises a body inside which is formed a stage bore receiving the end of the camshaft and allowing the passage of a screw adapted to bear against a portion of said body so as to ensure the fixing of the device on the camshaft. The body also includes radial grooves cooperating with tenons of the vacuum pump for transmitting the torque to said pump. In addition, the bore of the body is shaped to allow fluid communication between the camshaft and the vacuum pump to lubricate the pump with a lubricating fluid used for the engine. In addition to the fact that this device causes a difficult assembly, it includes a body of relatively complex and expensive form, which may be incompatible with mass industrialization.

La présente invention a donc pour but de remédier à ces inconvénients, en proposant un dispositif d' accouplement d'une pompe à vide avec un arbre à cames de moteur à combustion interne particulièrement facile à monter, économique, fiable.The present invention therefore aims to overcome these disadvantages, by providing a coupling device of a vacuum pump with an internal combustion engine camshaft particularly easy to assemble, economical, reliable.

La présente invention a également pour but de prévoir un dispositif d' accouplement d'une pompe à vide avec un arbre à cames pouvant être accouplé audit arbre à cames après calage de ce dernier. A cet effet, l' invention a pour objet un dispositif d' accouplement d'une pompe à vide avec un arbre à cames tubulaire de moteur à combustion interne pour véhicule automobile, comprenant un embout pourvu de première et seconde portions coaxiales délimitant un espace annulaire à l'intérieur duquel est montée une des extrémités de l' arbre à cames, au moins une desdites portions étant apte à transmettre un couple à l' arbre à cames, et de moyens de transmission dudit couple à la pompe.The present invention also aims to provide a coupling device of a vacuum pump with a camshaft which can be coupled to said camshaft after wedging thereof. To this end, the subject of the invention is a device for coupling a vacuum pump with a tubular camshaft of an internal combustion engine for a motor vehicle, comprising a nozzle provided with first and second coaxial portions delimiting an annular space. within which is mounted one end of the camshaft, at least one of said portions being adapted to transmit torque to the camshaft, and means for transmitting said torque to the pump.

Ladite seconde portion axiale est munie d'un logement s' étendant le long dudit axe et destiné à recevoir un moyen de prélèvement de la pompe apte à prélever un fluide lubrifiant acheminé à l' intérieur de l' arbre à cames de manière à assurer une communication fluidique entre l' arbre à cames et la pompe.Said second axial portion is provided with a housing extending along said axis and intended to receive a means of sampling the pump capable of taking a lubricating fluid conveyed inside the camshaft so as to ensure fluidic communication between the camshaft and the pump.

Le dispositif présente l' avantage de comprendre un unique embout permettant non seulement la transmission d'un couple à l' arbre à cames ainsi qu' à la pompe à vide, mais également l' alimentation en fluide de ladite pompe par l' intermédiaire de l' arbre à cames, et ce, de manière particulièrement simple et économique, tout en se dégageant de contraintes de montage coûteuses et complexes. Préférentiellement, la première portion comprend un alésage à l' intérieur duquel est emmanchée l' extrémité de l' arbre à cames.The device has the advantage of comprising a single end piece allowing not only the transmission of a torque to the shaft and the vacuum pump, but also the fluid supply of said pump via the camshaft, in a particularly simple and economical way, while freeing from mounting constraints. expensive and complex. Preferably, the first portion comprises a bore inside which is fitted the end of the camshaft.

Avantageusement, les première et seconde portions sont reliées entre elles par une paroi d' extrémité radiale.Advantageously, the first and second portions are interconnected by a radial end wall.

Une telle disposition permet l' obtention d'un embout étanche limitant sensiblement les éventuelles fuites vers l' extérieur du fluide lubrifiant présent à l' intérieur de l' arbre à cames.Such an arrangement makes it possible to obtain a sealed end piece substantially limiting any leakage to the outside of the lubricating fluid present inside the camshaft.

Dans un mode de réalisation particulièrement avantageux, les première et seconde portions ainsi que la paroi d' extrémité sont monoblocs, ce qui permet l' obtention d'un dispositif économique, facile à monter et à transporter.In a particularly advantageous embodiment, the first and second portions and the end wall are monobloc, which allows to obtain an economical device, easy to assemble and transport.

L' espace annulaire peut présenter une dimension radiale sensiblement supérieure à l' épaisseur de l' arbre à cames.The annular space may have a radial dimension substantially greater than the thickness of the camshaft.

De préférence, l'embout comprend, en outre, au moins une portion radiale formant bride s' étendant vers l' extérieur à partir de la première portion et apte à recevoir un couple d'entraînement de l' arbre à cames.Preferably, the tip further comprises at least one radial flange portion extending outwardly from the first portion and adapted to receive a driving torque from the camshaft.

Avantageusement, les moyens de transmission du couple à la pompe comprennent de rainure radiale ménagée au niveau de l' embout.Advantageously, the torque transmission means to the pump comprise radial groove formed at the tip.

Le dispositif comprend, en outre, un flasque fixé sur l' arbre à cames, un pignon de jumelage rapporté sur ledit flasque d' extrémité, un pignon de chaîne fixé sur ledit pignon de jumelage, l' embout étant monté directement ou indirectement sur le pignon de chaîne.The device further comprises a flange secured to the camshaft, a pairing pinion mounted on said end flange, a chain sprocket attached to said pairing gear, the hub being mounted directly or indirectly on the spindle. chain sprocket.

De préférence, le logement de la seconde portion axiale est constitué d'un alésage. La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation pris à titre d' exemple nullement limitatif et illustré par les dessins annexés, sur lesquels :Preferably, the housing of the second axial portion consists of a bore. The present invention will be better understood on reading the detailed description of an embodiment taken by way of non-limiting example and illustrated by the appended drawings, in which:

-la figure 1 est une vue schématique en coupe d'un dispositif d' accouplement selon l' invention monté sur un arbre à cames et entraînant une pompe à vide ;FIG 1 is a schematic sectional view of a coupling device according to the invention mounted on a camshaft and driving a vacuum pump;

-la figure 2 est une vue en perspective du dispositif de la figure 1 ; etFIG 2 is a perspective view of the device of Figure 1; and

-les figures 3 et 4 sont des vues en perspective d'un embout du dispositif de la figure 1.FIGS. 3 and 4 are perspective views of a tip of the device of FIG.

Sur les figures 1 et 2, on a représenté un arbre 1 à cames pourvu d'un dispositif conforme à l'invention, désigné par la référence numérique générale 2, et permettant l' accouplement d'une pompe à vide 3 avec ledit arbre 1. L' arbre 1 à cames a été illustré de manière partielle. On notera cependant qu' il est essentiellement constitué d'un tube 4 portant extérieurement un ensemble de cames 5, comme cela est connu en soi.Figures 1 and 2 show a camshaft 1 provided with a device according to the invention, designated by the general numerical reference 2, and allowing the coupling of a vacuum pump 3 with said shaft 1 The camshaft 1 has been partially illustrated. Note, however, that it consists essentially of a tube 4 externally carrying a set of cams 5, as is known per se.

Le dispositif d' accouplement 2 comprend un embout 6 réalisé en une seule pièce et pourvu d'une première portion 7 annulaire, formant un manchon coaxial à l' arbre 1 , et solidarisée à l'une des extrémités du tube 4. La première portion 7 se prolonge vers l' intérieur, axialement du côté de la pompe à vide 3, par une paroi radiale 8 d' extrémité, qui se prolonge elle-même axialement, du côté opposé à ladite pompe 3, par une seconde portion axiale 9 essentiellement cylindrique. La seconde portion 9 comprend ici une surface radiale frontale 9a sensiblement décalée axialement par rapport à une surface radiale frontale 7a de la première portion 7, en direction de la paroi 8 radiale. Les première et seconde portions 7, 9 sont coaxiales et délimitent un espace annulaire 8a à l'intérieur duquel est montée l' extrémité du tube 4. L' espace annulaire 8a présente ici une dimension radiale sensiblement supérieure à l' épaisseur de l' arbre 1 à cames, de manière à laisser subsister un léger espace radial entre un alésage dudit arbre et la seconde portion 9 pour faciliter l' emmanchement de la première portion 7 sur l' arbre 1 , lors du montage de l' embout 6.The coupling device 2 comprises a tip 6 made in one piece and provided with a first annular portion 7, forming a sleeve coaxial with the shaft 1, and secured to one end of the tube 4. The first portion 7 is extended axially in the direction of the vacuum pump 3, by a radial end wall 8, which extends axially itself, on the opposite side to said pump 3, by a second axial portion 9 essentially cylindrical. The second portion 9 here comprises a front radial surface 9a substantially axially offset with respect to a front radial surface 7a of the first portion 7, in the direction of the radial wall 8. The first and second portions 7, 9 are coaxial and define an annular space 8a inside which the end of the tube 4 is mounted. The annular space 8a here has a radial dimension substantially greater than the thickness of the shaft. 1 to cams, so as to leave a slight radial space between a bore of said shaft and the second portion 9 to facilitate the fitting of the first portion 7 on the shaft 1, during assembly of the nozzle 6.

Comme illustré plus visiblement sur les figures 3 et 4, l' embout 6 comprend également des portions radiales formant brides, ici au nombre de trois et référencées 10 à 12, s' étendant radialement vers l' extérieur à partir de la première portion 7 et aptes à recevoir un couple moteur. Les brides 10 à 12 sont ici réparties de manière régulière sur la circonférence de la première portion 7 et comprennent respectivement des alésages 10a à 12a permettant le passage de vis de fixations (non représentées) pour la transmission du couple moteur.As illustrated more clearly in FIGS. 3 and 4, the end piece 6 also comprises radial portions forming flanges, here three in number and referenced 10 to 12, extending radially outwardly from the first portion 7 and able to receive a driving torque. The flanges 10 to 12 are here uniformly distributed over the circumference of the first portion 7 and respectively comprise bores 10a to 12a allowing the passage of fastening screws (not shown) for the transmission of the engine torque.

En ce qui concerne la première portion 7, celle-ci est destinée à transmettre ledit couple moteur reçu par les brides 10 à 12 à la pompe à vide 3. Le couple transmissible est fonction de la longueur de la première portion 7, de son épaisseur ainsi que de sa limite à la rupture.With regard to the first portion 7, it is intended to transmit said motor torque received by the flanges 10 to 12 to the vacuum pump 3. The transmittable torque is a function of the length of the first portion 7, its thickness as well as its limit at break.

Pour transmettre ce couple à la pompe à vide 3, l' embout 6 comprend une rainure radiale 13 pratiquée au niveau de la paroi d' extrémité 8 radiale et coopérant avec des tenons 15 et 16 de la pompe 3, de forme complémentaire, disposés à une de ses extrémités axiales. Bien entendu, il est également envisageable de prévoir d' autres moyens de transmission du couple moteur à la pompe 3. Toutefois, l'utilisation de tels tenons 15, 16 et rainure 13 est particulièrement simple et efficace. L' embout 6 comprend également un logement 17 réalisé ici sous la forme d'un alésage traversant de part en part la seconde portion 9, et qui débouche au niveau d'une surface frontale de la paroi 8 radiale. Le logement 17 est coaxial avec l' arbre 1 à cames. Afin de permettre une communication fluidique entre l' arbre 1 à cames à l' intérieur duquel est acheminé un fluide lubrifiant avec la pompe à vide 3, un moyen de prélèvement 18 de ladite pompe est monté à l' intérieur dudit logement 17.To transmit this torque to the vacuum pump 3, the nozzle 6 comprises a radial groove 13 formed at the radial end wall 8 and cooperating with lugs 15 and 16 of the pump 3, of complementary shape, arranged to one of its axial ends. Of course, it is also conceivable to provide other means of transmission of the engine torque to the pump 3. However, the use of such pins 15, 16 and groove 13 is particularly simple and effective. The tip 6 also comprises a housing 17 formed here in the form of a bore passing right through the second portion 9, and which opens at a front surface of the radial wall 8. The housing 17 is coaxial with the camshaft 1. In order to allow fluid communication between the camshaft 1 into which a lubricating fluid is conveyed with the vacuum pump 3, a sampling means 18 of said pump is mounted inside said housing 17.

Le moyen de prélèvement 18 comprend une pipette 19 tubulaire coaxiale avec l' arbre 1 et montée en partie à l' intérieur d'un alésageThe sampling means 18 comprises a tubular pipette 19 coaxial with the shaft 1 and mounted partly inside a bore

19a de la pompe à vide 3. La pipette 19 est en saillie par rapport à une surface d' extrémité de ladite pompe 3, et pourvue, à proximité de son extrémité axiale, d'une lèvre annulaire 20 en contact avec le logement 17 de manière à réaliser une bonne étanchéité entre l' embout 6 et ladite pipette 19 afin de limiter sensiblement les risques de fuites vers l' extérieur du fluide lubrifiant. La pipette 19 permet ainsi d' alimenter en fluide lubrifiant des canaux d' alimentation 21 de la pompe 3 pour sa lubrification.19a of the vacuum pump 3. The pipette 19 is projecting with respect to an end surface of said pump 3, and provided, near its axial end, an annular lip 20 in contact with the housing 17 of in order to achieve a good seal between the nozzle 6 and said pipette 19 to substantially reduce the risk of leakage to the outside of the lubricating fluid. The pipette 19 thus makes it possible to supply lubricating fluid to the supply channels 21 of the pump 3 for its lubrication.

L' embout 6 est ainsi non seulement destiné à recevoir un couple moteur, à le transmettre à l' arbre à cames 1 ainsi qu' à la pompeThe nozzle 6 is thus not only intended to receive a driving torque, to transmit it to the camshaft 1 as well as to the pump

3, mais permet également d' alimenter en fluide lubrifiant ladite pompe 3 à partir du fluide circulant dans l' arbre 1 à cames.3, but also makes it possible to supply lubricating fluid to said pump 3 from the fluid flowing in the camshaft 1.

Afin de recevoir un couple moteur, le dispositif 2 d' accouplement comprend également un organe d' entraînement 22 pourvu ici d'un flasque 23 fixé sur l' arbre 1 à cames au voisinage de son extrémité axiale, d'un pignon de jumelage 24 disposé sur ledit flasque 23, d'un pignon de chaîne 25 rapporté sur ledit pignon de jumelage, axialement du côté opposé au flasque 23, et d'une entretoise 26 de fixation montée axialement entre le pignon de chaîne 25 et la surface radiale frontale 9a de l' embout 6.In order to receive a driving torque, the coupling device 2 also comprises a drive member 22 here provided with a flange 23 fixed on the camshaft 1 near its axial end, with a pairing pinion 24. disposed on said flange 23, a chain sprocket 25 attached to said pairing gear, axially on the opposite side to the flange 23, and a fixing spacer 26 mounted axially between the chain gear 25 and the front radial surface 9a of the end piece 6.

En variante, il est également envisageable de prévoir une unique pièce regroupant le pignon de chaîne 25 et l' entretoise 26. Toutefois, l' entretoise 26 permet de pouvoir utiliser des pignons 24,Alternatively, it is also conceivable to provide a single piece comprising the chain sprocket 25 and the spacer 26. However, the spacer 26 makes it possible to use sprockets 24,

25 existants.25 existing ones.

Lors du montage du dispositif 2 d' accouplement, une première étape consiste à fixer le flasque 23 sur l' arbre 1 à cames, par exemple par soudage, par frettage, ou encore par collage. Puis, on met en place le pignon de jumelage 24, le pignon de chaîne 25, et l' entretoise 26, par l' intermédiaire de vis de fixation (non représentées), sur le flasque 23, sans serrer lesdites vis. On bloque ensuite en rotation le vilebrequin du moteur et l' arbre 1 à cames, et on tend une chaîne de distribution montée sur le pignon 25. En fonction de la tension de ladite chaîne, les pignons 24 et 25 pivotent légèrement par rapport à l' arbre 1 à cames grâce à des trous oblongs (non représentés) pratiqués sur ledit pignon. On immobilise enfin les pignons 24, 25 et l' entretoiseWhen mounting the coupling device 2, a first step is to fix the flange 23 on the camshaft 1, for example by welding, by shrinking, or by gluing. Then, the pairing pinion 24, the chain pinion 25, and the spacer 26 are put in place, by means of fixing screws (not shown), on the flange 23, without tightening the said screws. The crankshaft of the engine and the camshaft 1 are then locked in rotation, and a distribution chain mounted on the pinion 25 is tensioned. Depending on the tension of said chain, the pinions 24 and 25 pivot slightly with respect to the 1 camshaft through oblong holes (not shown) formed on said pinion. Finally, the sprockets 24, 25 and the spacer are immobilized

26 sur le flasque 23 grâce aux vis de fixation, et on obtient ainsi un calage particulièrement précis du vilebrequin et de l' arbre 1 à cames. Une fois que l' organe d' entraînement 22 est ainsi monté sur l' arbre 1 à cames, on fixe l' embout 6 sur l' entretoise 26 en bout d' arbre 1 , qui permet, et ce, de manière particulièrement économique, de transmettre le couple moteur à l' arbre à cames 1 et à la pompe 3, et d' alimenter ladite pompe en fluide lubrifiant avec le même fluide que celui utilisé pour ledit arbre à cames. 26 on the flange 23 through the fastening screws, and thus obtaining a particularly accurate setting of the crankshaft and the camshaft 1. Once the drive member 22 is thus mounted on the camshaft 1, the end piece 6 is fixed to the spacer 26 at the end of the shaft 1, which makes it possible, and this, in a particularly economical manner, transmitting the engine torque to the camshaft 1 and the pump 3, and supplying said pump with lubricating fluid with the same fluid as used for said camshaft.

Claims

REVENDICATIONS 1 -Dispositif d' accouplement d'une pompe à vide avec un arbre à cames de moteur à combustion interne pour véhicule automobile, caractérisé en ce qu' il comprend un embout (6) pourvu de première et seconde portions (7, 9) coaxiales délimitant un espace annulaire (8a) à l' intérieur duquel est monté une des extrémités de l' arbre à cames, au moins une desdites portions étant apte à transmettre un couple à l' arbre à cames, et de moyens de transmission dudit couple à la pompe, ladite seconde portion axiale étant munie d'un logement ( 17) s' étendant le long dudit axe et destiné à recevoir un moyen de prélèvement de la pompe apte à prélever un fluide lubrifiant acheminé à l' intérieur de l' arbre à cames de manière à assurer une communication fluidique entre l' arbre à cames et la pompe.1 -Device for coupling a vacuum pump with a camshaft of an internal combustion engine for a motor vehicle, characterized in that it comprises a nozzle (6) provided with first and second coaxial portions (7, 9). defining an annular space (8a) within which is mounted one end of the camshaft, at least one of said portions being adapted to transmit a torque to the camshaft, and means for transmitting said torque to said camshaft; the pump, said second axial portion being provided with a housing (17) extending along said axis and intended to receive a pump sampling means adapted to take a lubricant fluid conveyed inside the shaft to cams so as to ensure fluid communication between the camshaft and the pump. 2-Dispositif selon la revendication 1 , caractérisé en ce que ladite première portion comprend un alésage à l' intérieur duquel est emmanchée l' extrémité de l' arbre à cames.2-Device according to claim 1, characterized in that said first portion comprises a bore inside which is fitted the end of the camshaft. 3-Dispositif selon la revendication 1 ou 2, caractérisé en ce que les première et seconde portions sont reliées entre elles par une paroi d' extrémité (8) radiale. 4-Dispositif selon la revendication 3, caractérisé en ce que les première et seconde portions et la paroi d' extrémité sont monoblocs.3-Device according to claim 1 or 2, characterized in that the first and second portions are interconnected by a radial end wall (8). 4-Device according to claim 3, characterized in that the first and second portions and the end wall are monobloc. 5-Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l' espace annulaire présente une dimension radiale sensiblement supérieure à l' épaisseur de l' arbre à cames.5-Device according to any one of the preceding claims, characterized in that the annular space has a radial dimension substantially greater than the thickness of the camshaft. 6-Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l' embout comprend, en outre, au moins une portion radiale formant bride ( 10 à 12) s'étendant vers l' extérieur à partir de la première portion et apte à recevoir un couple d' entraînement de l' arbre à cames.6-Device according to any one of the preceding claims, characterized in that the tip further comprises at least one radial portion forming a flange (10 to 12) extending towards the outside from the first portion and adapted to receive a driving torque of the camshaft. 7-Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens de transmission du couple à la pompe comprennent une rainure ( 13) radiale ménagée au niveau de l' embout.7-Device according to any one of the preceding claims, characterized in that the torque transmission means to the pump comprises a groove (13) radial formed at the tip. 8-Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu' il comprend, en outre, un flasque (23) fixé sur l' arbre à cames, un pignon de jumelage (24) rapporté sur ledit flasque d' extrémité, un pignon de chaîne (25) fixé sur ledit pignon de jumelage, l' embout étant monté directement ou indirectement sur le pignon de chaîne.8-Device according to any one of the preceding claims, characterized in that it further comprises a flange (23) fixed on the camshaft, a pairing pinion (24) attached to said end flange , a chain sprocket (25) fixed on said pairing gear, the bit being mounted directly or indirectly on the sprocket. 9-Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le logement est constitué d'un alésage. 9-Device according to any one of the preceding claims, characterized in that the housing consists of a bore.
EP06794455A 2005-06-03 2006-05-24 Device for coupling a vacuum pump with a camshaft comprising means supplying lubricating fluid Withdrawn EP1891305A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0505613A FR2886696B1 (en) 2005-06-03 2005-06-03 DEVICE FOR COUPLING A VACUUM PUMP WITH A CAMSHAFT COMPRISING LUBRICANT FLUID FEED MEANS
PCT/FR2006/050474 WO2007003819A2 (en) 2005-06-03 2006-05-24 Device for coupling a vacuum pump with a camshaft comprising means supplying lubricating fluid

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EP1891305A2 true EP1891305A2 (en) 2008-02-27

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EP06794455A Withdrawn EP1891305A2 (en) 2005-06-03 2006-05-24 Device for coupling a vacuum pump with a camshaft comprising means supplying lubricating fluid

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US (1) US20080196522A1 (en)
EP (1) EP1891305A2 (en)
JP (1) JP2008542615A (en)
KR (1) KR20080014755A (en)
CN (1) CN101184908A (en)
FR (1) FR2886696B1 (en)
RU (1) RU2007149000A (en)
WO (1) WO2007003819A2 (en)

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DE102009038132B4 (en) 2009-08-12 2015-12-24 Joma-Polytec Gmbh vacuum pump
US8449271B2 (en) * 2010-05-17 2013-05-28 GM Global Technology Operations LLC Engine assembly including camshaft with integrated pump
FR2966876A1 (en) * 2010-11-02 2012-05-04 Peugeot Citroen Automobiles Sa Pump arrangement e.g. vacuum pump arrangement, for e.g. diesel engine of motor vehicle, has pump directly integrated into cylinder head in end of camshaft, where case of pump is formed integrally with cylinder head by molding operation
DE102011080267A1 (en) * 2011-08-02 2013-02-07 Schaeffler Technologies AG & Co. KG Verschiebenutkontur of sliding cam units of a reciprocating internal combustion engine
DE102012202066A1 (en) * 2012-02-10 2013-08-14 Mahle International Gmbh Camshaft / motor shaft
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JP6070231B2 (en) * 2013-02-01 2017-02-01 スズキ株式会社 Vacuum pump mounting structure
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FR2886696A1 (en) 2006-12-08
US20080196522A1 (en) 2008-08-21
KR20080014755A (en) 2008-02-14
FR2886696B1 (en) 2007-08-31
WO2007003819A3 (en) 2007-02-22
CN101184908A (en) 2008-05-21
WO2007003819A2 (en) 2007-01-11
RU2007149000A (en) 2009-07-20
JP2008542615A (en) 2008-11-27

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